package com.gz.util;

import java.util.Random;

public class MathUtil {
	public static String getRandom20() {
		String str="";
		for(int i=0;i<20;i++){
			str+=String.valueOf((int)(Math.random()*9));
		}
		return str;
	}
	public static double getRandomDouble16() {
		Random random = new Random();
		return random.nextDouble();
	}
}
